EP0391955B1 - Procede de preparation de tellure de dialkyle et de selenium de dialkyle - Google Patents
Procede de preparation de tellure de dialkyle et de selenium de dialkyle Download PDFInfo
- Publication number
- EP0391955B1 EP0391955B1 EP89900619A EP89900619A EP0391955B1 EP 0391955 B1 EP0391955 B1 EP 0391955B1 EP 89900619 A EP89900619 A EP 89900619A EP 89900619 A EP89900619 A EP 89900619A EP 0391955 B1 EP0391955 B1 EP 0391955B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tellurium
- further characterised
- dialkyl
- group
- selenium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C395/00—Compounds containing tellurium
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C391/00—Compounds containing selenium
Definitions
- This invention relates to a method for the preparation of dialkyls of the Group (VI) metals tellurium and selenium.
- the metals tellurium and selenium are of importance in semiconductor technology, for example in the preparation of the infra-red detector material cadmium mercury telluride (CMT) and in light switches respectively.
- CMT cadmium mercury telluride
- alkyls of the relevant semiconductor material which can relatively easily be thermally dissociated to form an epitaxial layer of the material or a layer containing the material.
- Such alkyls have the additional advantage that they are otherwise relatively stable and may be purified further via the formation of adducts with for example Lewis base adjuvants such as trialkyl or triaryl Group (V) compounds.
- the present invention seeks to overcome or alleviate the problems outlined above by providing a method for the preparation of dialkyls of tellurium and selenium in a substantially more pure state, or at least in a state that facilitates further purification.
- Other objects and advantages of the present invention will be apparent from the following description.
- the reaction is preferably carried out under conditions which exclude atmospheric oxygen, for example under an inert atmosphere eg nitrogen. Oxidation by the atmosphere can result in impurities.
- a preferred temperature is below 20°C, especially -40°C to 0°C.
- impurities may be formed, such a neohexyl Group (I) metal alkyls.
- the method is suitable for the preparation of all dialkyls, but is especially suitable for the preparation of di-C1-C4 alkyls of tellurium and selenium, which may be straight chain, branched or tertiary alkyls, for example tellurium and selenium dimethyl, diethyl, dipropyl (n- and iso-) or dibutyl (n-, iso- and tert.-), especially tellurium dimethyl and di-tert.-butyl.
- the Group (I) metal is preferably lithium, sodium or potassium, especially lithium.
- Preferred Group (I) metal alkyls are therefore MeLi and tert.-BuLi.
- the ether is a di-C2-C5 alkyl ether, especially a di-n-alkyl ether.
- the alkyl groups of the dialkyl of di-n-alkyl ether may be the same or different and a particularly preferred ether is diethyl ether. Whatever ether is/are used, it/they should preferably have a low boiling point.
- alkane If an alkane is present it must be liquid at the reaction temperature, and suitable alkanes include n-pentane.
- the halide of the Group (VI) element is the chloride, eg Te(IV)Cl4 or Se(IV)Cl4.
- the reaction is preferably carried out using about stoichiometric quantities of the reactants.
- the Group (I) metal alkyl is dissolved in the alkane, and this solution is added slowly to the halide suspended or dissolved in the ether.
- the mixture may be stood at room temperature or refluxed if necessary to ensure completion.
- the solution of the dialkyl product may be separated from solid residues by filtration. Excess Group (I) alkyl may be destroyed by adding water. The tellurium or selenium dialkyl may then be isolated by evaporation of the solvent followed by vacuum distillation.
- the method of the invention provides dialkyls of tellurium or selenium suitable for use in semiconductor formation, eg in epitaxial deposition. It may however be preferable in some cases to further purify the dialkyls by the known process of secondary adduct formation to produce an adduct with a lower dissociation temperature than that of the dialkyl itself at the pressure of secondary adduct dissociation. Other known further purification methods may be used.
- the Group (VI) dialkyls produced using the method of this invention also constitute a novel product, being in a generally purer form than has been hitherto available using known preparation processes.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Claims (15)
- Procédé de préparation de dialkyltellure ou de dialkylsélénium à l'aide d'un composé alkylique d'un métal du Groupe I dans un solvant, qui est au moins un éther aliphatique en C₄ à C₁₀ ou qui contient un tel éther, caractérisé par la réaction du composé alkylique du métal du Groupe I avec un halogénure de tellure (IV) ou de sélénium (IV), le solvant contenant aussi éventuellement un alcane liquide, et par la production de dialkyltellure ou de dialkylsélénium avec un rendement élevé.
- Procédé selon la revendication 1, caractérisé en outre en ce que le dialkyltellure ou le dialkylsélénium a deux groupes alkyle en C₁ à C₄.
- Procédé selon la revendication 2, caractérisé en outre en ce que du di-tert-butyltellure est préparé.
- Procédé selon la revendication 2, caractérisé en outre en ce que du diméthyltellure est préparé.
- Procédé selon la revendication 1, caractérisé en outre en ce que l'halogénure de tellure (IV) ou de sélénium (IV) est le chlorure.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en outre en ce que le métal du Groupe I est le lithium, le potassium ou le sodium.
- Procédé selon la revendication 6, caractérisé en outre en ce que le métal du Groupe I est le lithium.
- Procédé selon la revendication 6, caractérisé en outre en ce que le composé alkylique du métal du Groupe I est du méthyl-, éthyl-, propyl- (n- ou iso-) ou butyl- (n-, iso- ou tert-) -lithium, -sodium ou -potassium.
- Procédé selon la revendication 8, caractérisé en outre en ce que le composé alkylique du métal du Groupe I est le tert-butyllithium ou le méthyllithium.
- Procédé selon la revendication 1, caractérisé en outre en ce que le solvant est un éther dialkylique.
- Procédé selon la revendication 10, caractérisé en outre en ce que le solvant est le diéthyléther.
- Procédé selon la revendication 1, caractérisé en outre en ce que la réaction est réalisée dans des conditions assurant l'exclusion de l'oxygène atmosphérique.
- Procédé selon la revendication 1, caractérisé en outre en ce que la réaction est réalisée au-dessous de 20°C.
- Procédé selon la revendication 13, caractérisé en outre en ce que la réaction est exécutée à une température comprise entre -40°C et 0°C.
- Procédé selon la revendication 1, caractérisé en outre en ce que du di-tert-butyltellure est préparé par réaction de t-BuLi avec du tétrachlorotellure (IV) à une température inférieure à 20°C dans un solvant qui contient du diéthyléther.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8728392 | 1987-12-04 | ||
GB878728392A GB8728392D0 (en) | 1987-12-04 | 1987-12-04 | Method for preparation of dialkyl tellurium & dialkyl selenium |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0391955A1 EP0391955A1 (fr) | 1990-10-17 |
EP0391955B1 true EP0391955B1 (fr) | 1993-08-18 |
Family
ID=10627999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89900619A Expired - Lifetime EP0391955B1 (fr) | 1987-12-04 | 1988-12-02 | Procede de preparation de tellure de dialkyle et de selenium de dialkyle |
Country Status (7)
Country | Link |
---|---|
US (2) | US5091570A (fr) |
EP (1) | EP0391955B1 (fr) |
JP (1) | JP2568287B2 (fr) |
KR (1) | KR0156551B1 (fr) |
DE (1) | DE3883394T2 (fr) |
GB (2) | GB8728392D0 (fr) |
WO (1) | WO1989005292A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8913799D0 (en) * | 1989-06-15 | 1989-08-02 | Secr Defence | Method for preparation of organotellurium and selenium compounds |
US5166428A (en) * | 1990-06-08 | 1992-11-24 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Method for preparation of organo-tellurium and selenium compounds |
GB2260979A (en) * | 1991-10-03 | 1993-05-05 | Secr Defence | Preparation of dialkyl compounds of tellurium and selenium. |
US20090215225A1 (en) | 2008-02-24 | 2009-08-27 | Advanced Technology Materials, Inc. | Tellurium compounds useful for deposition of tellurium containing materials |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1578731A (en) * | 1923-10-03 | 1926-03-30 | Gen Motors Corp | Process of producing dialkyl selenides and tellurides |
DD243495B1 (de) * | 1985-12-18 | 1988-06-29 | Univ Halle Wittenberg | Verfahren zur herstellung von diethyltellur |
US4946994A (en) * | 1987-12-21 | 1990-08-07 | The United States Of America As Represented By The Secretary Of The Navy | Preparation of ditertiarybutyltelluride |
-
1987
- 1987-12-04 GB GB878728392A patent/GB8728392D0/en active Pending
-
1988
- 1988-12-02 KR KR1019890701469A patent/KR0156551B1/ko not_active IP Right Cessation
- 1988-12-02 GB GB8828174A patent/GB2213148B/en not_active Expired - Lifetime
- 1988-12-02 JP JP1500390A patent/JP2568287B2/ja not_active Expired - Lifetime
- 1988-12-02 DE DE89900619T patent/DE3883394T2/de not_active Expired - Lifetime
- 1988-12-02 EP EP89900619A patent/EP0391955B1/fr not_active Expired - Lifetime
- 1988-12-02 WO PCT/GB1988/001065 patent/WO1989005292A1/fr active IP Right Grant
- 1988-12-02 US US07/488,076 patent/US5091570A/en not_active Expired - Lifetime
- 1988-12-02 US US07/536,579 patent/US5117021A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
Bulletin des Sociétés Chimiques Belges, 79 (1970) 383-390 * |
Also Published As
Publication number | Publication date |
---|---|
JP2568287B2 (ja) | 1996-12-25 |
GB8728392D0 (en) | 1988-01-13 |
US5117021A (en) | 1992-05-26 |
KR900700444A (ko) | 1990-08-13 |
US5091570A (en) | 1992-02-25 |
DE3883394T2 (de) | 1994-02-17 |
EP0391955A1 (fr) | 1990-10-17 |
JPH03501478A (ja) | 1991-04-04 |
GB8828174D0 (en) | 1989-01-05 |
KR0156551B1 (ko) | 1998-12-01 |
GB2213148A (en) | 1989-08-09 |
DE3883394D1 (de) | 1993-09-23 |
WO1989005292A1 (fr) | 1989-06-15 |
GB2213148B (en) | 1991-07-10 |
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